Grate



(No Model.) 2 sheetssheet 2.

G; W. WALKER. GRATE.

10.412.570 Patentdoot. `a,-1889 N. Parras, Pham-wwwa'. wnmngm, ne,

UNITED STATES PATENT OFFICE.

GEORGE W. WALKER, OF MALDEN, MASSACHUSETTS.

GRATE.

SPECIFICATION forming part of Letters Patent No. 412,570, dated October 8, 18,89.l

Application iiled January 10, 1889. Serial No. 296,013. (No model.) i

To @ZZ whom it may concern:

Be it known that I, GEORGE W. WALKER, of Malden, county of Middlesex, State of Massachusetts, have invented an Improvement in Gratos, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts. v

This invention in grates is an improvement upon the grate shown and described in United States Patent No. 362,063, and has for its object to improve the construction of the same, whereby a vstronger and more efficient grate is obtained.

In accordance with my invention the central section of the grateconsists of a casting composed, preferably, of two longitudinal bars or webs united at intervals by cross-bars to leave central air-spaces, the said longitudinal bars or webs being provided at their outer side with projections which co-operate with ingers on the side bars or agitators. Each side bar is made With a deep longitudinal Vweb, from which project fingers, and each nger at its junction with the web is made of substantially .the same-width as the web, the

, said finger being made tapering from the said web toward its end. In this manner a very strong side bar is produced from a minimum amount of metal, whereby increased strength is obtained and warping of the said side bars obviated. Each side bar may be provided with a locking projection on its rear side or on its under side, substantially in line with the journal. The bed-plate is provided at its front and rear sides with orifices through which the journals-of the central section are extended, so that when the said section is placed in position it cannot be accidentally dislodged or unlocked from its operative position by vertical movement of the grate, while at the same time the grate-bars may be removed without disturbing the lining.

The particular features in which my invention consists will be pointed out in the claims at ithe end of this specication.

Figure 1 is a top or plan view of a grate embodying my invention. Fig. la is a plan view of the grate with the center bar drawn out; Fig. 2, a transverse section of the bedplate on line as Fig. 1,-the grate being omitted; Fig. 3, a transverse section of the bed-plate and grate on line y y; Fig. 4, a sectional detail showing a modified form of side bar and linger; Fig. 5, a detail, to be referred to, made on an enlarged scale; Fig. 6, a sectional detail on line fr', Fig. 2, looking to- -ward the left; and Fig. '7, a detail to be referred to.

The bed-plate A, preferably cast in one piece, is provided at its front and rear ends with inwardlyextended projections a a', shaped to form bearings for the journals 0.2 w3 of the central section of the grate.

The central sect-ion of thegrate is made as a single casting composed of longitudinal bars or webs c# a5, united at intervals by cross-bars a6, leaving central air-spaces a". The longitudinal bars 0,4 a5 are made deep, and are provided on their outer side with projections a8, with which co-operate iingers b of like side bars or agitators, composed, essentially, of the said fingers and deep longitudinal webs b2, provided at their `ends* with journals b4 b5, which rest in bearings formed by projections b 57 on the inner side of the front and rear ends of the bed-plate. The fingers b at their junction with t-he web are of substantially the same width as the said web, and are made tapering toward their points or ends, as shown in Figs. 3 and 4. The deep longitudinal web and the ngers, made Wide at their junction with the said web, make a very strong side bar or agitator, and entirely obviates warping and buckling of the said bar. The upper edge of the tingers oi' the side bars will be rounded or in the arc of a circle, as shown in Figs. 3 and 4, and while l prefer to have the under side ot the iingers shaped as shown in Fig. 3, the said under side may be made substantially straight, 'as shown in Fig. 4. The rear end of the bed-plate is provided with an orifice c, (see Fig. 2,) into which the journal as of the central section is extended, the upper side or wall of the orifice c crossing` the said journal and forming a locking device by which the central section is locked when in operative position, the said central .sectionbeing prevented from being lifted bodily upward when being operated. Each side bar may beprovided with a locking-Enger c', (see Figs. l and 5,) forming part of the web and IOO located below and in line with the journal c2 of the said side bar, and it may be provided with one or more limiting projections c3 on the back or rear ot the web to limit the downward movement of the side bar, the said projection,

as herein shown, entering a slot c4 in the side of the bed-plate. The bearin g b is provided with aslot c5, (see Fig. 7,) through which the finger c is passed when the side bar is placed in po- 1o sition, the said finger being located below and out of line with the slot c5 when the side bar is dropped or turned into its normal position.

(Shown in Fig. l.) Each side bar is preferably provided with a number of short teeth 'i 5 d, leaving air-spaces d', through which ashes may pass.

The :lingers l) on the side bars will preferably be located so as to rest upon and be acted upon by the projections as on the central scction, as shown by full lines, Fig. l, thus leaving air-spaces through which air may pass to support combustion, the said air-spaces atfording an outlet for ashes and clinkers when the central section is oscillated by a suitable 2 5 handle, (not showin) but which is iitted upon the end of the journal a2.

The locking-nger c is so located Von the side bars and the slot c5 so made in the bearing h4 that the said side bars cannot be dis- 3o placed or moved vertically by the central section while being oscillated or shaken in the operation of the grate, and can only be removed by hand when the said side bars are turned so that the ngers b stand perpendicular, or substantially at a right angle to their n)ormal operative position. (Shown in Fig. l.

By means of the orifice c in the bed-plate the central section is locked against vertical 4o movement without disturbing the lining of the stove, the said central section being readily removable for repairs by drawing it out into the dotted-line position shown in Fig. l, the journal as being at such time withdrawn from the orice c.

The longitudinal bars or Webs of the central section may be made of any desired depth to obtain strength, and by making the said central section of deep bars provided with lingers the metal surface near the tire is re- 5o duced, the greater portion of the said metal surface being lowered down or away from the ire, thus obviating buckling and warping of the said central section.

By making the upper edge of the fingers of the side bars rounded or in the arc of a circle the coal resting upon the said fingers will drop or roll down onto the central section when the latter is rotated or shaken to agitate the material upon the grate. 6o

- I claiml. The combination, with the bedplate provided with a jbearing having a slot, as c5, of a rocking grate consisting of the central section and side bars, and a locking projection on one or both of said side bars belowv the journals of the said side bars, the said locking projection being passed through the said slot and located below the bearing of thegratebar journals out of line with the said slot 7o when the side bar is in operative position and capable of being rocked, substantially as described.

2. The combination, with the bed-plate, of the grate consisting of the central section pro- 7 5 vided with projections, and independent rocking side bars having fingers co-operating'with the projections of the central section, and provided with a limiting projection on its rear side to co-operate with the bed-plate, 8o substantially as described.

3. The herein-described side bar, consisting of the deep longitudinal web b2, provided with journals at its ends and with a locking-finger c', and fingers connected to side of the said 85 web and made at their junction with the web of a depth substantially equal to the width of the web, and having their upper surface made substantially in the arc of a circle, substantially as and for the purpose specified. 9o

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEO: W. WALKER.

Witnesses:

G. W. GREGORY, A. S. WIEGAND. 

